Infrared digital reflective-holographic 3D shape measurements

We present a series of experiments to demonstrate digital holography on reflective objects at wavelength 10.6 mu m of a CO2 laser using a pyrocam array. Fresnel holograms of reflective objects are recorded by a Mach-Zehnder interferometer. We describe a method for improving the accuracy of the numerical reconstructions and for compensating the loss of resolution at longer wavelength by Fresnel reconstruction of digitally recorded infrared holograms. (c) 2007 Elsevier B.V. All rights reserved.